Definition: In this task, you are given an input list A. You need to extract and sort the unique digits used in the list in ascending order. Return -1 if there is no digit in the list.
Input: ['c', 'e', '479', 'e', 'w', '225', '21', 'p', 'c', 'l']

1, 2, 4, 5, 7, 9